I'm sure you've run into this person. They're perpetually sarcastic, but rather than being a frowning cynic, they laugh about it. Insults are hidden as jokes. Or maybe jokes are misunderstood as insults.

They don't lie about anything around them, but they are perpetually insincere. A straight answer is impossible to get and even a twisted answer has an unknown number of twists before the truth is found.

I'm reminded of Dr. Horrible, in which Captain Hammer is described as cheesy, prompting a call to "trust your instincts." Then a deeper layer is brought up which is much better. But! "Sometimes there's an even deeper layer which is the same as the outside" Maybe this person is actually nice with a bad outside. Or maybe they're a jerk with a good middle layer of jokes but then the outer layer is a jerk again, so that anyone who digs down finds the second layer and thinks they've found the total complexity.